I wouldn't even carry luggage for my wife or my mother, even if traveling with them. My mother once said "We haven't had problems with my morphine when we visited China (She's old and suffers from hip arthrosis). Actually I had put half in your dad's luggage, in case they lost mine." My dad wasn't happy, especially at how casual she sounded. She didn't even carry the doctor's ordinance. Most people don't understand the risks of being abroad.
I had to take narcotics into Dubai for a health issue I was facing at the time. You can bet I had the clearly marked prescription bottle with the minimum amount I needed for my trip along with a note from my doctor explaining the medication. The medication was always accompanied by those, too.
As screwed up as drug laws are in the US, they are child's play compared to what some countries have. And once they think that you might be trafficking, you are in for a bad day.
